yes phatinjun i did try 60 and 75g but it didnt like those either. the 75 hornadys keyholed and yes i polished the bore with jb and i have a borescope and although its not as smooth as i would like it isnt bad. this is my first 22-250 i have 223,243,6.5,270,308,30-06, 44mag and other than the 44mag they all looked pretty good as far as the bores are concerned.